Philips PM 5508 Operating Manual page 52

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a. Signal amplitude too low
b. Signal amplitude correct
c. Signal amplitude too high
Fig. VII-28. Red-colourdifference-signal of "COLOUR BAR"-pattern
3. • Switch on the red gun and switch off the blue gun. If required, adjust
"AMPL (R-Y)" so that there is no difference in brightness between
the red bars and the red section at the bottom of the picture (See
Fig. VII-28).